On Thursday night, Avijit Roy, a well-known Bangladeshi American writer and religious skeptic, was surrounded by unidentified assailants armed with cleavers and hacked to death on a street in Dhaka. His wife, Rafida Ahmed, sustained serious wounds and is fighting for her life. On social media, you can find awful images of the immediate aftermath of the incident, with Ahmed, drenched in blood, standing stunned by the fallen body of her husband.